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Preparation method of phosphor-nitrogen-containing polyelectrolyte complex flame-retardant EVA (ethylene vinyl acetate)

A polyelectrolyte and complex technology, applied in the field of preparation of phosphorus-nitrogen-containing polyelectrolyte complex flame retardant EVA, can solve problems such as complex synthesis process, achieve simple preparation process, good application prospect and good flame retardant performance Effect

Inactive Publication Date: 2014-07-30
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers often introduce phosphorus and nitrogen elements into the molecular structure of flame retardants through chemical synthesis, which often requires complex synthesis processes

Method used

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  • Preparation method of phosphor-nitrogen-containing polyelectrolyte complex flame-retardant EVA (ethylene vinyl acetate)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) At room temperature, add 1 part by weight of chitosan to 20 parts by weight of deionized water, stir at a speed of 1000 r / min to a uniform suspension, and then add 5 parts by weight of 5 mol / L dilute hydrochloric acid Solution, stirred at a speed of 1000 r / min until uniform and transparent solution, using 5mol / L hydrochloric acid dilute solution and 5mol / L sodium hydroxide dilute solution to adjust its pH value to 0.5 to obtain a positively charged chitosan solution .

[0020] (2) At room temperature, add 1 part by weight of phytic acid to 20 parts by weight of deionized water, stir at a speed of 1000 r / min until a uniform and transparent solution is obtained, and oxidize with 5 mol / L hydrochloric acid dilute solution and 5 mol / L hydrogen Dilute sodium solution to adjust its pH value to 0.5 to obtain a negatively charged phytic acid solution.

[0021] (3) At room temperature, under stirring at a speed of 1000 r / min, add 20 parts by weight of the negatively charged ...

Embodiment 2

[0025] (1) At room temperature, add 1 part by weight of chitosan to 200 parts by weight of deionized water, stir at a speed of 50 r / min to a uniform suspension, and then add 0.5 part by weight of 1 mol / L hydrochloric acid dilute Solution, stirred at a speed of 50 r / min until uniform and transparent solution, using 1 mol / L hydrochloric acid dilute solution and 1 mol / L sodium hydroxide dilute solution to adjust its pH value to 5.0 to obtain positively charged chitosan sugar solution.

[0026] (2) At room temperature, add 1 part by weight of phytic acid to 200 parts by weight of deionized water, stir at a speed of 50 r / min to a uniform and transparent solution, and use 1mol / L hydrochloric acid dilute solution and 1mol / L hydrogen to oxidize Dilute sodium solution to adjust its pH to 5.0 to obtain a negatively charged phytic acid solution.

[0027] (3) At room temperature, under stirring at a speed of 50 r / min, add 200 parts by weight of the negatively charged phytic acid solution...

Embodiment 3

[0031] (1) At room temperature, add 1 part by weight of chitosan to 100 parts by weight of deionized water, stir at a speed of 500 r / min to a uniform suspension, and then add 3 parts by weight of 3 mol / L dilute hydrochloric acid solution, stirred at a speed of 500 r / min until uniform and transparent solution, and adjusted its pH value to 1.5 with 3 mol / L hydrochloric acid dilute solution and 3 mol / L sodium hydroxide dilute solution to obtain positively charged chitosan sugar solution.

[0032] (2) At room temperature, add 1 part by weight of phytic acid to 100 parts by weight of deionized water, stir at a speed of 500 r / min to a uniform and transparent solution, and use 3mol / L hydrochloric acid dilute solution and 3mol / L hydrogen to oxidize Dilute sodium solution to adjust its pH to 1.5 to obtain a negatively charged phytic acid solution.

[0033] (3) At room temperature, under stirring at a speed of 500 r / min, add 50 parts by weight of the negatively charged phytic acid solu...

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Abstract

The invention discloses a preparation method of phosphor-nitrogen-containing polyelectrolyte complex flame-retardant EVA (ethylene vinyl acetate). The preparation method comprises the following steps of: dissolving chitosan in hydrochloric acid dilute liquor to obtain chitosan liquor with positive charges; dissolving phytic acid in deionized water to obtain phytic acid liquor with negative chargers; dropwise adding the phytic acid liquor with negative chargers into the chitosan liquor with positive chargers to obtain polyelectrolyte complex of the chitosan and phytic acid; mixing the polyelectrolyte complex of the chitosan and phytic acid with the EVA to obtain a polyelectrolyte complex flame-retardant EVA material of the chitosan and phytic acid. The preparation method disclosed by the invention is simple in preparation process and does not need complex chemical treatment; the polyelectrolyte complex of the chitosan and phytic acid is rich in phosphor and nitrogen elements, and biodegradable; and the obtained EVA material is good in flame resistance and has very good application prospect in fields such as shoe materials, films, electric wires and cables, toys, and the like.

Description

Technical field [0001] The present invention involves a method of preparation of flame retardant materials, especially for a preparation method for the flame -retardant EVA of phosphate -nitrogen -containing polycopic electrolyte. Background technique [0002] EVA (ethylene-ethyl acetate cluster) is made of ethylene and ethyl acetate, which has good flexibility, impact resistance and transparency, and is widely used in shoe, film, wire and cables, and toys.However, EVA is easy to burn and largely limits its application.Therefore, effective flame retardant modifications for EVA are particularly important. [0003] The flame retardant does not contain halogen that does not contain halogen, and phosphorus and nitrogen as the main composition element.This type of flame retardant has good flame retardant, low and low toxic, and has good development prospects.At present, researchers often introduce phosphorus and nitrogen into flame retardant molecular structures through chemical synth...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L5/08C08K5/521
CPCC08L23/0853C08L2201/02C08L2201/06C08L5/08C08K5/521
Inventor 张涛张宝悦陈飞王超琪
Owner ZHEJIANG SCI-TECH UNIV